/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.apache.streampipes.extensions.management.connect;

import org.apache.streampipes.extensions.api.connect.IPullAdapter;
import org.apache.streampipes.extensions.api.monitoring.SpMonitoringManager;
import org.apache.streampipes.model.monitoring.SpLogEntry;
import org.apache.streampipes.model.monitoring.SpLogMessage;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeoutException;

public class PullAdapterScheduler {

  protected static final Logger LOG = LoggerFactory.getLogger(PullAdapterScheduler.class);

  private ScheduledExecutorService scheduler;

  public void schedule(IPullAdapter pullAdapter,
                       String adapterElementId) {
    scheduler = Executors.newSingleThreadScheduledExecutor();
    final Runnable task = new Runnable() {
      @Override
      public void run() {
        try {
          pullAdapter.pullData();
        } catch (ExecutionException | InterruptedException | TimeoutException e) {
          LOG.error("Error while pulling data", e);
          SpMonitoringManager.INSTANCE.addErrorMessage(
              adapterElementId,
              SpLogEntry.from(System.currentTimeMillis(), SpLogMessage.from(e))
          );
        } finally {
          scheduler.schedule(
              this,
              pullAdapter.getPollingInterval().value(),
              pullAdapter.getPollingInterval().timeUnit()
          );
        }
      }
    };

    scheduler.schedule(
        task,
        pullAdapter.getPollingInterval().value(),
        pullAdapter.getPollingInterval().timeUnit()
    );
  }

  public void shutdown() {
    scheduler.shutdownNow();
  }
}
